~ 
GROWTH OF THE CEREBRAL CORTEX 101 
TABLE 9 
Showing the observed and corrected values of the area of the cerebral cortex and of 
the total section in the frontal section and the percentage of the cortical area in the 
total frontal section of the Norway rat brain, accompanied by the data for the 
correction-coeficient in the individual cases and the correction-coefficient for the 
group. W. Dis the frontal diameter of the cerebrum, 
OBSERVED Beer aa CORRECTED epee 
GROUP BRAIN CORTICAL 
Nae Area of | W.D The Arena) reno 
A f : Area of 
corter | ttt, | “brain | mS” | cortex | sce, | szcri0N 
grams 4 mm. mm,2 mm. mm. mm .* mm 2 per cent 
INEXGIG bos led 13.8 28.1 13.00 10.00 | 23.4 47.5 49 
a 1.160 12.8 27.9 12.70 9.80 21.5 47.0 46 
1 1-175 10.9 23.6 12.50 8.80 | 22.1 47.7 |« 46 
1.163 12.5 26.5 1.34? 22.3 47 4 47 
N XII 
N XIIla) 1.369 307 27.9 13.00 9.80 24.2 49.2 49 
L869 13.7 27.9 Meo" 24.2 49.2 49 
N XIV b]| 1.407 14.0} 27.8 13.05 9.50! | 26.5 52.7 £0 
g| 1.429 14.0} 28.5 13.20 S)eai0) PAY Al 55.0 49 
a 1.431 14.6 30.4 12.85 10.20 23.2 48.4 48 
1 1.431 14.9 29.6 13.40 10.30 25.3 50.2 50 
e 1.437 12.6 28.7 13'.25 9.60 24.1 54.1 44 
ke 1445 13-2 28.4 13.30 9.50 26.0 05.8 47 
1.480 13.9 28.9 1.35? 25 4 52.7 48 
NXVe aly 13.0) 29.0 13.20 9.60 24.7 55.0 45 
e il aay WA, 20.0 13.50 9,20 27.4 55.4 49 
a| 1.564 14.1 29.0 13.50 | 9.80 |, 26.8 55.0 49 
1.546 13.3 27.9 1.40? 26.3 55.1 48 
N XVI a| 1.619 14 oles 13.80 10.50°| 25.4 54.2 47 
g 1.632 13.8 27.6 13.70 9.50 28.8 57.6 50 
e 1.636 13.2 | 28.2 13.80 GHGON 2% Se gaen2 47 
1.629 13.9 29.0 1.40° 27.2 56.7 48 
NXVile 1.710 13.4 | 29.5 13.80 970) 27-2 59.8 44 
g 1.721 15.7 32.1 13.60 10.10 28.5 58.4 49 
a| 1.738 I5s2)) y3d520| ello 10.60 | 27.0 98.8 46 
c 1.788 15.0 | 30.7 13.95 10.10 | 28.6 58.6 49 
LUE) LS) Sl 12ol 27.8 58.9 47 
